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Mold vacuum heat treatment anti-deformation method

A vacuum heat treatment and anti-deformation technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as unachievable and effectively avoid mold deformation, and achieve the effects of low cost, cost saving and simple operation

Inactive Publication Date: 2019-03-26
NINGBO HELI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above measures still cannot effectively avoid the deformation during the heat treatment of the mold, and cannot meet the engineering requirement that the deformation amount be less than three thousandths

Method used

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  • Mold vacuum heat treatment anti-deformation method
  • Mold vacuum heat treatment anti-deformation method
  • Mold vacuum heat treatment anti-deformation method

Examples

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Embodiment 1

[0024] In embodiment one, a certain automobile rear longitudinal beam die-casting mold made of SDYZ steel is used for testing, as attached figure 1 As shown, the specific anti-deformation method of vacuum heat treatment is as follows:

[0025] Step 1. Select a mold that meets the surface quality requirements after rough machining, and check whether the hole in the mold and the surface of the cavity are intact, and whether there is a risk of cracking. There should be no burrs or sharp corners on the edge of the hole in the mold and the surface of the cavity. defect etc.

[0026] Step 2. Clean the surface of the mold that meets the requirements of step 1, and then fill various types of holes and deep and larger concave cavities with materials that can conduct heat and have better heat preservation properties, such as asbestos, steel blocks, and iron chips.

[0027] Step 3. Wrap the easy-to-crack parts of the mold after step 2 with asbestos for protection.

[0028] Step 4. Put ...

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Abstract

The invention discloses a mold vacuum heat treatment anti-deformation method. The method is characterized by comprising the following steps: step one, heat-resistant filler is filled in various holesand relatively large inner concave cavity of a mold; step two, the mold filled with the heat-resistant filler is placed in a vacuum quenching furnace for heat treatment. The method has the advantage that some external measures can be adopted in the heat treatment process of the mold without influencing the heat treatment process of the mold, so that the deformation of the mold caused by volume expansion and contraction caused by thermal stress and structural stress comprehensive action can be reduced.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a method for preventing deformation of a mold by vacuum heat treatment. Background technique [0002] During the vacuum heat treatment of the mold, especially during the vacuum quenching process of the large mold, due to the size effect of the mold and the depth of the cavity surface, especially when there are a large number of holes and a deep cavity surface, the heating and cooling speed of each part is inconsistent The resulting temperature difference, coupled with the anisochronism of tissue transformation, makes the volume expansion and contraction of each part of the mold section uneven, and the tissue transformation is uneven, resulting in tissue stress and thermal stress caused by the temperature difference between the inside and outside of the mold. When the internal stress exceeds the yield limit of the mold, it will cause the deformation of the mold. Once the m...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D1/773C21D1/18
CPCC21D1/18C21D1/773C21D9/0068
Inventor 王春涛姚杰刘洪波吴晓春左鹏鹏党卫东计杰
Owner NINGBO HELI TECH CO LTD
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